Interior Instrument Tech http://www.iitsltd.com/

Shepherd Instruments http://www.shepherdinstruments.com/

Mid-west Instruments http://www.backflowtestkits.com/

Wescan Calibration http://www.wescancal.com/

BAVCO Parts & Repair http://www.bavco.com/index.php

Ames http://www.amesfirewater.com/Products/Backflow_PreventersAccessories

Apollo http://www.apollovalves.com/backflow

Febco http://www.febcoonline.ca/

Watts http://www.wattscanada.ca/backflowprevention

Wilkins http://backflowparts.com/wilkins-catalog/

AMES

CONBRACO